On May 7th, 2008, China National Intellectual Property Administration announced an invention patent-special cigarette filter and its preparation method, which was applied by Hongta Tobacco (Group) Co., Ltd. The invention relates to a cigarette filter, which is technically characterized in that acetate fiber with high dtex/ktex specification is selected to produce 4-5 thin filter rods, and the thin rods can be acetate fibers with specifications of 8.8dtex/3.3ktex or 6.6dtex/ 1.88ktex respectively. Each thin rod uses 3000 and 600010.0 ~15.0mm filter rods with equal circumference, and the length is120mm, 90mm,100mm,132mm or/kloc-0. 4 ~ 5 thin rods are combined into a filter rod with a circumference of 24.0 ~ 24.5 mm. The main advantages are: by changing the internal structure of the filter, when the mainstream smoke passes through the filter, it can play the role of filtration and internal dilution at the same time. The filtration depends on the acetate fiber thin rods in the filter rod, and the internal dilution depends on the air in the mainstream smoke passing through the gaps of the thin rods, thus forming filtration and dilution in the filter rod at the same time. It is said that the invention can effectively improve the filtration efficiency by 20% ~ 40% and reduce the volatile and semi-volatile harmful substances in the mainstream smoke gas phase by 20% ~ 40% under the condition that the suction resistance of the filter rod is the same as that of the conventional filter rod, and the structure is novel and the production process is simple.
At present, this research achievement has been applied to the "Favourite" series products such as Favourite, Favourite (Gold), Favourite (Red), Favourite (Purple), Favourite (Soft) and Favourite (Hard), as well as the "Lucky Dragon and Phoenix" (festive treasure) series products. As long as consumers open the filter of each cigarette, they will see some dark particles, which are compound biochemical harm-reducing agents attached to tea. In order to make this preparation more uniform, Sichuan-Chongqing Zhongyan has also made a series of technical breakthroughs, so that the addition of each cigarette is strictly controlled within the allowable fluctuation range, ensuring that each cigarette achieves the best harm reduction effect.